describe('Storage overwrite', () => {
  ["localStorage", "sessionStorage"].forEach(function(name) {
    test(function() {
      var storage = window[name];
      storage.clear();

      runTest();
      function doWedgeThySelf() {
        storage.setItem("clear", "almost");
        storage.setItem("key", "too");
        storage.setItem("getItem", "funny");
        storage.setItem("removeItem", "to");
        storage.setItem("length", "be");
        storage.setItem("setItem", "true");
      }

      function runTest() {
        doWedgeThySelf();

        assert_equals(storage.getItem('clear'), "almost");
        assert_equals(storage.getItem('key'), "too");
        assert_equals(storage.getItem('getItem'), "funny");
        assert_equals(storage.getItem('removeItem'), "to");
        assert_equals(storage.getItem('length'), "be");
        assert_equals(storage.getItem('setItem'), "true");

        // Test to see if an exception is thrown for any of the built in
        // functions.
        storage.setItem("test", "123");
        storage.key(0);
        storage.getItem("test");
        storage.removeItem("test");
        storage.clear();
        assert_equals(storage.length, 0);
      }

    }, name + " should be not rendered unusable by setting a key with the same name as a storage function such that the function is hidden");
  });
});